js中容易掉坑的几道面试题

今天看了几道面试题，有点易错，嗯，整理出来，你们一块儿看喽html 一、看题：web (function(){ var a = b = 3; })(); console.log("a defined? " + (typeof a !== 'undefined'));//a defined? false console.log("b defined? " +

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